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Selectively Permeable Selectively Permeable Membranes “Lab”Membranes “Lab”
Selectively Permeable Selectively Permeable Membranes “Lab”Membranes “Lab”
Honors BiologyHonors Biology
Pre-lab• Before you begin the lab, it is
important that you answer the 5 pre-lab questions.
• Use the next few slides (or your notes or the book) if you do not already know the answers to these questions!
Did you know?• Isotonic solutions have the same
amount of solute as a cell
Did you know?• Hypertonic Solutions have more
solute than a cell
Did you know?• Hypotonic solutions have less
solute than a cell
Still confused?Here is a great animation of hypertonic/hypertonic
cells:http://www.zerobio.com/flashmx/tonicity.swf
Here are pictures of actual cells in all 3 solutions:http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter21/animation__hemolysis_and_crenation.html
Part IPart IPart IPart I
Plant Root Tissues in SolutionPlant Root Tissues in Solution
Plant Tissue in Solution
15% Salt Solution
5% Salt Solution
Distilled Water
Part IIPart IIPart IIPart II
Plant Leaf Cells in SolutionPlant Leaf Cells in Solution
Plant Leaf Cells in SolutionInitial Image
Salt Water Solution
Distilled Water
Want to see another image for Part II?
• Here is a link to a YouTube video that will help you see what happens to a cell placed in a salt water solution: http://www.youtube.com/watch?v=lzDlGl3b4is&feature=related
• This is an onion cell, so you will not see chloroplasts, but it will really help you see the change in size of the cell! Remember that the cell wall will not change size, just the cell membrane.
Part IIIPart IIIPart IIIPart III
Simulated Animal Cells in Simulated Animal Cells in SolutionSolution
Simulated Animal Cells in Solution
Benedict’s Test After 24 Hours
Iodine Test After 24 Hours
Initial Set-Up
Post-Lab• Now answer the 5 post-lab questions. • If you have any questions please see
your teacher! You will be designing your own lab investigations in the coming week and all of the information from this lab will be important to understand!
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